If anyone has better conversion technology than Izotope I would be interested to hear those samples for my own comparison, as a practical matter I would like to have the best possible bit reduced versions in my library in addition to my 24 bit versions.

If anyone is interested in specific notes on what I'm hearing as the differences in my playback system then let me know.

He could just up-convert to the highest bit depth/sample rate in order to avoid all that. If ABX results are inconclusive (which will be the case in all likelihood, even taking into account the second conversion) then we're pretty much done. If the ABX results indicate a positive identification then we can start honing in on the cause of the difference, beginning with the processing then the hardware before concluding that 16/44.1 is inadequate as a delivery format for digitized vinyl.

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Breath is found in waveform and spectral plots;DR figures too, of course.